ART

Yeah, until now I was not talking about it, because it was hard to introduce it before talking about the bonuses.

AT Mode on Hihouden (秘宝伝)

On some machines, and they are usually the machine you can make the most money on, they don't give you a lot of bonus.
Instead, they put you in an ART mode.
An ART, is like a special game mode.
When you enter in it, you get around 50% of ROI (Return On Investment).
That means that if you put 50 medals in the machine, you'll receive 75 medals.
Of course it's great, but all the good things got an end.
And when you enter ART, you just hope for it to continue !!

Usually, you enter in that mode with 50 "games" (by game, I mean one roll, meaning 3 medals inserted).
And while you're inside it, you'll receive more and more games (or not), and your counter is going to grow. In really good cases, you'll receive +300 games bonus at one time (the more I saw was +520g on midori don(緑ドン) once)
You can continue getting new games to your game counter like that for hours.
It's really on those machines that you're going to get a lot of money.
On machines where the gamble line is higher like "Hihouden"（秘宝伝）, "Million God"（ミリオンゴッド） or "Bancho 2"（押忍!番長2）, you can expect 10 000 medals at the end of the day (meaning 200 000yen) if you're really lucky.

+200 game bonus ! (on Hihouden 秘宝伝)

Talking a little more about ART, when you enter on it, the machine is going to ask you to press the buttons in a special order. It's not from left to right anymore.
You will see numbers 1, 2, and 3 on the screen, indicating you which button you have to press.
If you press correctly, you'll get a replay, or bells.
And that's how you're going to get all your medals ! By accumulating those "bells", that are giving you only 15 medals !! But if you want your money, you'll have to do this for hundreds, or thousands of times, until your game counter is over.
It sounds completely crazy, I know, but when you're winning, and you're getting more and more medals(=money), you don't really want it to stop, and you pretty much enjoy the moment !
In the worst case, I think you can stay 8 hours inside the parlor doing that.

Completely crazy right ?
And then, you'll understand why Japanese are sitting for hours in front of their machines !